1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright © 2008, 2013 Citrix Systems, Inc. 5 * Copyright © 2012 Spectra Logic Corporation 6 * Copyright © 2021 Elliott Mitchell 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/param.h> /* required by xen/xen-os.h */ 32 33 #include <vm/vm.h> 34 #include <vm/pmap.h> 35 36 #include <machine/atomic.h> /* required by xen/xen-os.h */ 37 38 #include <xen/xen-os.h> 39 #include <xen/hvm.h> 40 41 #include <contrib/xen/vcpu.h> 42 43 /*-------------------------------- Global Data -------------------------------*/ 44 /** 45 * Start info flags. ATM this only used to store the initial domain flag for 46 * PVHv2, and it's always empty for HVM guests. 47 */ 48 uint32_t hvm_start_flags; 49 50 /*------------------ Hypervisor Access Shared Memory Regions -----------------*/ 51 shared_info_t *HYPERVISOR_shared_info; 52 53 /*------------------------------- Per-CPU Data -------------------------------*/ 54 DPCPU_DEFINE(struct vcpu_info *, vcpu_info); 55 56 void 57 xen_setup_vcpu_info(void) 58 { 59 /* This isn't directly accessed outside this function */ 60 DPCPU_DEFINE_STATIC(vcpu_info_t, vcpu_local_info) 61 __attribute__((aligned(64))); 62 63 vcpu_info_t *vcpu_info = DPCPU_PTR(vcpu_local_info); 64 vcpu_register_vcpu_info_t info = { 65 .mfn = vtophys(vcpu_info) >> PAGE_SHIFT, 66 .offset = vtophys(vcpu_info) & PAGE_MASK, 67 }; 68 unsigned int cpu = XEN_VCPUID(); 69 int rc; 70 71 KASSERT(xen_domain(), ("%s(): invoked when not on Xen?", __func__)); 72 73 _Static_assert(sizeof(struct vcpu_info) <= 64, 74 "struct vcpu_info is larger than supported limit of 64 bytes"); 75 76 /* 77 * Set the vCPU info. 78 * 79 * NB: the vCPU info for some vCPUs can be fetched from the shared info 80 * page, but in order to make sure the mapping code is correct always 81 * attempt to map the vCPU info at a custom place. 82 */ 83 rc = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); 84 if (rc == 0) 85 DPCPU_SET(vcpu_info, vcpu_info); 86 else if (cpu < nitems(HYPERVISOR_shared_info->vcpu_info)) { 87 static bool warned = false; 88 89 DPCPU_SET(vcpu_info, &HYPERVISOR_shared_info->vcpu_info[cpu]); 90 91 if (bootverbose && !warned) { 92 warned = true; 93 printf( 94 "WARNING: Xen vCPU %u failed to setup vcpu_info rc = %d\n", 95 cpu, rc); 96 } 97 } else 98 panic("Unable to register vCPU %u, rc=%d\n", cpu, rc); 99 } 100